In the first of a series on nationalisation, we look at the critical tests ahead for the PM-in-waiting, from choosing a chancellor to the future of Thames Water

As he swept towards victory in the Makerfield byelection, Andy Burnham told voters he wanted to see “the essentials of life being run primarily for the public interest, not for the private interests”.

Citing the Bee Network of buses and trams across Manchester city region, brought together on his watch, Burnham repeatedly highlighted the need for more “public control” over the necessities of life. Water, energy, transport and housing are at the top of his list.

The hotter it gets, the faster our bodies lose water. Obviously, we need to replace it – but is anything better than plain H₂O? And does timing matter? Here’s what the science says

Hydration is important. In temperatures like those we’re increasingly seeing in much of the world, sweating can be the only way for our bodies to cool down, and our thirst isn’t always the best indicator of how much water we’ve lost or need. The consequences of not being sufficiently hydrated as temperatures creep towards the 40s can be severe, and can kick in much faster than most people realise. The good news is that remembering to drink plenty of water at regular intervals throughout the day will be enough for most people to avoid the worst. But if you’d like to understand why dehydration is so dangerous, whether you really need extra electrolytes, or if a cup of tea really can cool you down, read on.

To start with, it’s helpful to understand that our bodies are producing heat – and therefore losing water – all the time. “All the cells in our body are constantly using fuel for energy for various different processes, whether that’s movement or just staying alive,” says Dr Lewis James, a lecturer in sport, exercise and health sciences at Loughborough University. “About 75 to 80% of the energy that we use appears as heat.” If we didn’t have any way of dissipating this heat, then even lying on the couch would see your body temperature rise about 1.3C in a single hour (already enough to make you noticeably feverish) – but of course, we do. Normally, we lose a decent amount of heat through a combination of convection and radiation: the blood vessels in our skin dilate, allowing the blood to be cooled by the outside air. The problem is that when the external temperature goes up, this process becomes less effective and eventually stops working altogether. At this point, our main way of losing heat is through sweating: our bodies produce tiny droplets of warm water mixed with trace minerals, which (usually) evaporate on contact with the air, drawing heat away from the skin in the process. And as we rely more on sweating, it’s increasingly important to replace the fluids our bodies are losing.

From Algeria to Uzbekistan, we assess the standing of the 48 nations after the group stage of the tournament

It took a little over an hour for Kylian Mbappé to find his groove. Irked by a poor refereeing decision, he scored twice in France’s opener against Senegal. Ably supported by a stunning cast, Mbappé will already have his sights on winning the competition. Michael Olise has shown his class throughout, while Ousmane Dembélé dazzled with a hat-trick against Norway. We’ll see if anyone can stop Didier Deschamps’ team.

Document appears to have been subject to conflicting interpretations on key issues of Lebanon ceasefire and strait of Hormuz

• Middle East crisis live – latest updates

The sudden eruption of fresh hostilities in the Gulf – just 10 days after Iran and the US signed a memorandum of understanding to end the conflict – threatens to put the two countries back on the path to war.

It appears the deliberately opaque wording in the memorandum has been unable to withstand the pressure of conflicting interpretations, and as a result supporters of the deal inside Tehran are on the back foot. Statements to the effect that Iran’s government should never have agreed to reopen the strait of Hormuz are proliferating – and not just among the country’s hardliners.

The mayor hopes to ‘write a new chapter in the party’s history’ – and recent democratic socialist wins prove he might be able to do it

In the back yard of a Brooklyn bar, beneath strung-up lightbulbs and swaths of fabric that swooped like great sails, an ecstatic crowd greeted Zohran Mamdani, the New York City mayor, and his victorious ally, Brad Lander. These Democrats also had a withering verdict on their own party establishment.

“To me, centrists can go fuck themselves,” said Léa Zimmerman, 34. “They’re fucking useless, they don’t stand for anything, and if they do stand on something, it’s pathetic. I’m done with pathetic, performative people.”

Tottenham Hotspur Stadium, London
The Puerto Rican musician kicks off in a white suit fronting a salsa band in full flow, then switches up with a swaggering, chaotic rave in a replica island home

Midway through the largest British concert ever staged by a Latin-American artist, a giant cartoon toad appears on the big screens and admonishes those in the crowd who can’t speak Spanish: “You’re missing the message,” it warns. The giant cartoon frog has a point. Bad Bunny is given to lengthy between-song chat, delivered in his native tongue, which apparently cover everything from the recent earthquake in Venezuela to what seem to be subtly pointed remarks about the importance of people and places: his current world tour declines to take in the United States on the grounds that it might attract the attention of ICE, a not-unreasonable assumption given the tantrum thrown by Donald Trump over the singer’s headline appearance at the Superbowl half-time show (a tantrum, it’s worth noting, that helped propel Bad Bunny’s albums into the British Top 10 for the first time).

Equally, the cartoon toad needn’t have worried. For one thing, there are so many representatives of the diaspora in the crowd that his Spanish monologues are noticeably more warmly and loudly received than his solitary announcement in English. And, for another, if his show proves anything, it’s that you really don’t need to understand the lyrics to grasp why Bad Bunny has become one of the biggest stars in the world.

Tehran attacks Bahrain and Kuwait amid efforts to open strait of Hormuz without Iran’s direct oversight

• Middle East crisis live – latest updates

A new round of escalating strikes between Iran and the US has continued, further undermining the fragile interim peace agreement between the two countries, and prompting Donald Trump to threaten violence that would ensure Iran “will no longer exist”.

On Sunday, Tehran launched drone and missile attacks against Bahrain and Kuwait after new US strikes on sites in southern Iran and threatened a “complete halt” to negotiations to end the war. Trump said that a moment might come soon when he abandoned talks and the US would “militarily finish the job”.

Labour deputy leader says she thinks energy secretary would suit Treasury but ‘tittle-tattle’ over posts ‘unedifying’

Ed Miliband would make a “good” chancellor to Andy Burnham, Labour’s deputy leader, Lucy Powell, has said, before the likely next prime minister’s first major speech on the economy since he returned to Westminster.

Powell, who served as Miliband’s chief of staff in opposition and is close to the former party leader, appeared to endorse him to run the Treasury – although some in Burnham’s camp acknowledge such a move could be politically risky.

More than 191m people in Europe face temperatures over 35C, with extreme heat warnings from Germany to Hungary

• ‘A sad inevitability’: after decades of climate warnings, why is Europe so unprepared for rising heat?

Poland, Czechia and Slovakia are braced for record temperatures of over 40C as a heatwave linked to hundreds of deaths in western Europe spreads east.

More than 191 million people in Europe faced temperatures of at least 35C on Sunday, with extreme heat warnings in Germany, Czechia, Poland and Hungary.

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England reaction from our writers in New York/New Jersey.

Bellingham can be dismissed a little by some as a player of moments. Is that bad? Moments win games. Bellingham is 22 and still finding his final form. He promises to do these things, walks and talks like he might do them. But then he also does them, which seems important. With England paddling here, he had the will and the craft to take out the spoons and rattle something off on his knee just when they needed it most.